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  1. R

    Simple maths resistance exercice

    Find the voltage across the resistor or the current present in the resistor and compute the power. Use mesh or node analysis to find the current or voltage. Why could you not post only the schematic in a upright display instead of the irrelevant whole page on its side. Do you read a book...
  2. R

    Is the following a universal gate?

    As I said above, I don't think a MUX or its relatives like PLA's should be considered as a single gate. Ratch
  3. R

    Is the following a universal gate?

    There are basic or simple gates and compound or exotic gates. I don't think that the latter should be considered as a candidate for a universal gate. Same with MUX's and PLA's. You can dream up a logic function that would take several basic functions to implement and call it a universal...
  4. R

    Is the following a universal gate?

    There are 7 basic gates as described in this link. Look at the top of the first page. http://www.ee.surrey.ac.uk/Projects/CAL/digital-logic/gatesfunc/index.html#logicgates . Only two (NAND and NOR) are universal gates. The OR gate with one inverted input is not considered a basic gate, and is...
  5. R

    Relationship between theta and theta v theta i

    There is no theta v or theta i. If you find it in a textbook, show me. Q = S * Sin(theta) and P = S * Cos(theta) . It is a simple right triangle. Ratch
  6. R

    My Vacation

    A week ago I returned from my vacation. My wife and I visited Cedar Breaks National Monument (CB), Capitol Reef National Monument (CR), Bryce Canyon National Park (BC), and Arches National Park (AR), all in the state of Utah. A small sample of pictures follow. Many of the rock formations have...
  7. R

    Understanding N channel and P Channel FETs

    A BJT is also a transconductive device. Ratch
  8. R

    Is the following a universal gate?

    A gate with inverted inputs is not a basic gate. An AND gate with an inverted output is considered a basic gate. Perhaps you would like to peruse this link. I don't agree with it, but you probably do. They advocate nonbasic compound gates and show how they are universal. In fact, the...
  9. R

    Is the following a universal gate?

    No more than you can call an AND gate a universial gate by tacking an INVERTER on the output to make it a NAND gate. Besides, the OP's gate in not defined to be a basic gate (AND, NOR, etc). It is a complex gate. Ratch
  10. R

    Is the following a universal gate?

    You have to be joking. A FGPA is an array of programmable logic blocks that can be wired together to implement complex functions. It is not a simple basic recognized single gate that the definition of a universal logic gate requires. Ratch
  11. R

    Is the following a universal gate?

    How they are manufactured is not of interest. When you see the OP's submission on the market and accepted as a basic logic gate, then you can judge whether it is a universal gate or not. But right now, it takes two discrete logic gates to make the OP's submission. Ratch
  12. R

    Is the following a universal gate?

    The definition of a universal gate depends on the same type of gate being able to produce the same outputs of other gates . A black box makes the definition indeterminate. Ratch
  13. R

    Is the following a universal gate?

    Your definition is correct, but your implementation is wrong. As I pointed out in my previous post, the OP's submission is a 2-level combination gate. That makes it a no-no for consideration as a universal gate. Ratch
  14. R

    Is the following a universal gate?

    I will grant your point that the inputs do not have to be at the same logic level. However, the submission of the OP is automatically disqualified from being a universal gate because it is a combination of two different gates; specifically an OR gate and an INVERTER at the input. That makes it...
  15. R

    Is the following a universal gate?

    Not only is it trivial, it is wrong. Both inputs have to be at the same logic level, otherwise any gate could be considered a "universal" gate. Ratch
  16. R

    Is the following a universal gate?

    Be sure, be very sure. If you cannot invert a "one", how can it be a universal gate? Ratch
  17. R

    Is the following a universal gate?

    I stand by what I said. Show me how to invert a "one" with the gate that the OP submitted. NAND and NOR gates are known to be universal logic gates. Ratch
  18. R

    Is the following a universal gate?

    Easy question to answer. Every time the two inputs on the gate are the same, the output is always "one". Therefore, no inversion can be made when both inputs are "one". That disqualifies it as a universal gate. Same with an XOR and NXOR gate. Ratch
  19. R

    Vacation

    I'm back. Had a good time. Did not gamble, just visited. Ratch
  20. R

    Question about thevenin and norton's theorems

    The universal way to find the Thevenin impedance is to divide the open circuit voltage by the shorted current. That method will work even if there are dependent sources, which your circuit does not have. The open circuit voltage across A-B is easily seen to be 0.5 volts. The shorted current...
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